Thanks to all.

I have been cross checking the Ju87,Ju88 and Ju188 production lists and werknummers and can see that there is no overlap and that the numbers were assigned in batches – thank you.

http://www.geocities.ws/hjunkers/ju_ju87_p1.htm
http://www.geocities.ws/hjunkers/ju_ju88_p2.htm
http://www.geocities.ws/hjunkers/ju_ju88_p3.htm

I will rejoin the Luftwaffe Research Group.